Quizzical Quokka

When The Quizzical Quokka enters the battlefield, target opponent asks you a trivia
question. If you answer correctly, you gain 1 life,
and that opponent loses 1 life. If you answer incorrectly, you lose 1 life, and that opponent
gains 1 life.
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"Riddle me this: what's fuzzy, blue, and always
keeps you guessing?"
— Quokka's Conundrums, Volume IV